Sluggo,
I threw the shot, discus and javelin in college. I cant imagine why a PROPERLY thrown shot put would cause rotator cuff issues. However, having coached small kids at the elementary level, I know that MOST are inclined to throw the shot. This happens when the shot is elevated above the shoulder and the shoulder is allowed to rotate externally then internally to accelerate the ball(shot). OUCH.
Dont do it if this is the technique used.
Rollerman